"Shadowy objects in test tubes"

A reference to test tube babies, a term used to refer to in vitro fertilisation (IVF).  This is a method for overcoming difficulties conceiving a child, in which egg and sperm are introduced to each other outside of the womb.  In the same way that the clones in Never Let Me Go are thought of by some with revulsion, the intial response of many to the first test tube baby, born in 1978, was outrage.